在Android 10中为蓝牙LE启用链路层PDU大小251

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

if (bluetoothAdapter != null && bluetoothAdapter.isEnabled()) {
    BluetoothGatt bluetoothGatt = bluetoothDevice.connectGatt(context, false, gattCallback);
    bluetoothGatt.requestMtu(251).enqueue();
}

private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
    @Override
    public void onMtuChanged(BluetoothGatt gatt, int mtu, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            Log.d(TAG, "MTU changed to " + mtu);
        } else {
            Log.e(TAG, "Failed to change MTU, status: " + status);
        }
    }
};

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

if (ContextCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_CODE);
}